"Kill 3 guards from Stalking Zones" is an optional mission objective in Sequence 7 / Memory 03: Commodore Eighty-Sixed
Walkthrough[edit]
Guard One
Just as the memory is starting, duck into the Stalking Zone behind the single guard. You can easily get the first kill from him.
Guard Two
When you make it down to the beach from around the Queen's Staircase, you will be able to continue working on this objective. Get into the Stalking Zone between the tents. There you will find a soldier standing between 2 tents. Slip behind him and take him out with a whistle and an ambush.
Guard Three
Quuickly make your way South. There is a Brute nearby the Stalking Zones you can hurriedly take down there.